| IOS | infant observation scale; International Organization for Standardization |
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| IRDS | idiopathic respiratory distress syndrome; infant respiratory distress syndrome |
| IS | ileal segment; immediate sensitivity; immune serum; immunosuppression; impingement syndrome; incenti... |
| LBWI | low-birth-weight infant |
| LOWBI | low-birth-weight infant |
| left colic lymph nodes | Small nodes along the left colic artery and its branches that drain the left flexure and upper part of the descending colon; efferent vessels pass to the inferior mesenteric nodes. Synonym: nodi lymphatici colici sinistri. (05 Mar 2000) |
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| left colic vein | <anatomy, vein> A tributary of the inferior mesenteric vein that accompanies the left colic artery and drains the left flexure and descending colon. Synonym: vena colica sinistra. (05 Mar 2000) |